Freestanding MnO2@carbon papers air electrodes for rechargeable Li-O2 batteries

Leilei Zhang; Feifei Zhang; Gang Huang; Jianwei Wang; Xinchuan Du; Yuling Qin; Limin Wang

doi:10.1016/j.jpowsour.2014.03.094

Freestanding MnO₂@carbon papers air electrodes for rechargeable Li-O₂ batteries

Leilei Zhang, Feifei Zhang, Gang Huang, Jianwei Wang, Xinchuan Du, Yuling Qin, Limin Wang

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

We have designed the air electrode for rechargeable Li-O₂ batteries by adapting conventional current collectors-carbon papers (CPs), as freestanding substrates. The MnO₂@CP electrodes are prepared by simply floating CPs on KMnO₄ solution at room temperature. CPs act as the reducing agents as well as the freestanding substrates. Birnessite-type MnO₂ nanosheets are observed to in situ grow vertically from the surface of CPs, thus building 3D porous architecture. The nanosheets are uniformly distributed and interconnected each other, which contributes to an improved electrical connection among the MnO₂ catalyst and CPs. The cycling tests using the electrode as the cathode in rechargeable Li-O ₂ batteries exhibit high reversibility and superior cycling stability, over 90 cycles with a capacity of more than 1000 mA h (g MnO ₂)^-1 and a high coulombic efficiency of around 100% in the voltage rang of 2.2-4.4 V.

Original language	English
Pages (from-to)	311-316
Number of pages	6
Journal	Journal of Power Sources
Volume	261
DOIs	https://doi.org/10.1016/j.jpowsour.2014.03.094
State	Published - 1 Sep 2014
Externally published	Yes

Keywords

Freestanding electrode
In situ synthesis

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2014.03.094

Cite this

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title = "Freestanding MnO2@carbon papers air electrodes for rechargeable Li-O2 batteries",

abstract = "We have designed the air electrode for rechargeable Li-O2 batteries by adapting conventional current collectors-carbon papers (CPs), as freestanding substrates. The MnO2@CP electrodes are prepared by simply floating CPs on KMnO4 solution at room temperature. CPs act as the reducing agents as well as the freestanding substrates. Birnessite-type MnO2 nanosheets are observed to in situ grow vertically from the surface of CPs, thus building 3D porous architecture. The nanosheets are uniformly distributed and interconnected each other, which contributes to an improved electrical connection among the MnO2 catalyst and CPs. The cycling tests using the electrode as the cathode in rechargeable Li-O 2 batteries exhibit high reversibility and superior cycling stability, over 90 cycles with a capacity of more than 1000 mA h (g MnO 2)-1 and a high coulombic efficiency of around 100% in the voltage rang of 2.2-4.4 V.",

keywords = "Freestanding electrode, In situ synthesis",

author = "Leilei Zhang and Feifei Zhang and Gang Huang and Jianwei Wang and Xinchuan Du and Yuling Qin and Limin Wang",

year = "2014",

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day = "1",

doi = "10.1016/j.jpowsour.2014.03.094",

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T1 - Freestanding MnO2@carbon papers air electrodes for rechargeable Li-O2 batteries

AU - Zhang, Leilei

AU - Zhang, Feifei

AU - Huang, Gang

AU - Wang, Jianwei

AU - Du, Xinchuan

AU - Qin, Yuling

AU - Wang, Limin

PY - 2014/9/1

Y1 - 2014/9/1

N2 - We have designed the air electrode for rechargeable Li-O2 batteries by adapting conventional current collectors-carbon papers (CPs), as freestanding substrates. The MnO2@CP electrodes are prepared by simply floating CPs on KMnO4 solution at room temperature. CPs act as the reducing agents as well as the freestanding substrates. Birnessite-type MnO2 nanosheets are observed to in situ grow vertically from the surface of CPs, thus building 3D porous architecture. The nanosheets are uniformly distributed and interconnected each other, which contributes to an improved electrical connection among the MnO2 catalyst and CPs. The cycling tests using the electrode as the cathode in rechargeable Li-O 2 batteries exhibit high reversibility and superior cycling stability, over 90 cycles with a capacity of more than 1000 mA h (g MnO 2)-1 and a high coulombic efficiency of around 100% in the voltage rang of 2.2-4.4 V.

AB - We have designed the air electrode for rechargeable Li-O2 batteries by adapting conventional current collectors-carbon papers (CPs), as freestanding substrates. The MnO2@CP electrodes are prepared by simply floating CPs on KMnO4 solution at room temperature. CPs act as the reducing agents as well as the freestanding substrates. Birnessite-type MnO2 nanosheets are observed to in situ grow vertically from the surface of CPs, thus building 3D porous architecture. The nanosheets are uniformly distributed and interconnected each other, which contributes to an improved electrical connection among the MnO2 catalyst and CPs. The cycling tests using the electrode as the cathode in rechargeable Li-O 2 batteries exhibit high reversibility and superior cycling stability, over 90 cycles with a capacity of more than 1000 mA h (g MnO 2)-1 and a high coulombic efficiency of around 100% in the voltage rang of 2.2-4.4 V.

KW - Freestanding electrode

KW - In situ synthesis

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DO - 10.1016/j.jpowsour.2014.03.094

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